/*!	 valuenode_scale.cpp
**	 Implementation of the "Scale" valuenode conversion.
**
**	Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
**	Copyright (c) 2007, 2008 Chris Moore
**  Copyright (c) 2011 Carlos López
**
**	This package is free software; you can redistribute it and/or
**	modify it under the terms of the GNU General Public License as
**	published by the Free Software Foundation; either version 2 of
**	the License, or (at your option) any later version.
**
**	This package is distributed in the hope that it will be useful,
**	but WITHOUT ANY WARRANTY; without even the implied warranty of
**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
**	General Public License for more details.
**
*/

#ifdef USING_PCH
#	include "pch.h"
#else
#ifdef HAVE_CONFIG_H
#	include <config.h>
#endif

#include <synfig/general.h>
#include <synfig/localization.h>
#include <synfig/valuenode_registry.h>
#include "valuenode_scale.h"
#include "valuenode_const.h"
#include <stdexcept>
#include <synfig/color.h>
#include <synfig/vector.h>
#include <synfig/time.h>
#include <synfig/angle.h>
#include <ETL/misc>

#endif

using namespace std;
using namespace etl;
using namespace synfig;

REGISTER_VALUENODE(ValueNode_Scale, RELEASE_VERSION_0_61_06, "scale", "Scale")

ValueNode_Scale::ValueNode_Scale(const ValueBase &value):
    LinkableValueNode(value.get_type())
{
    Vocab ret(get_children_vocab());
    set_children_vocab(ret);
    set_link("scalar", ValueNode::Handle(ValueNode_Const::create(Real(1.0))));
    Type &type(value.get_type());

    if (type == type_angle) {
        set_link("link", ValueNode_Const::create(value.get(Angle())));
    } else if (type == type_color) {
        set_link("link", ValueNode_Const::create(value.get(Color())));
    } else if (type == type_integer) {
        set_link("link", ValueNode_Const::create(value.get(int())));
    } else if (type == type_real) {
        set_link("link", ValueNode_Const::create(value.get(Real())));
    } else if (type == type_time) {
        set_link("link", ValueNode_Const::create(value.get(Time())));
    } else if (type == type_vector) {
        set_link("link", ValueNode_Const::create(value.get(Vector())));
    } else {
        assert(0);
        throw runtime_error(get_local_name() + _(":Bad type ") + type.description.local_name);
    }

    assert(value_node);
    assert(value_node->get_type() == type);
    assert(get_type() == type);
}

LinkableValueNode*
ValueNode_Scale::create_new()const
{
    return new ValueNode_Scale(get_type());
}

ValueNode_Scale*
ValueNode_Scale::create(const ValueBase& value)
{
    return new ValueNode_Scale(value);
}

synfig::ValueNode_Scale::~ValueNode_Scale()
{
    unlink_all();
}

synfig::ValueBase
synfig::ValueNode_Scale::operator()(Time t)const
{
    if (getenv("SYNFIG_DEBUG_VALUENODE_OPERATORS")) {
        printf("%s:%d operator()\n", __FILE__, __LINE__);
    }

    if (!value_node || !scalar) {
        throw runtime_error(strprintf("ValueNode_Scale: %s", _("One or both of my parameters aren't set!")));
    } else if (get_type() == type_angle) {
        return (*value_node)(t).get(Angle()) * (*scalar)(t).get(Real());
    } else if (get_type() == type_color) {
        Color ret((*value_node)(t).get(Color()));
        Real s((*scalar)(t).get(Real()));
        ret.set_r(ret.get_r()*s);
        ret.set_g(ret.get_g()*s);
        ret.set_b(ret.get_b()*s);
        return ret;
    } else if (get_type() == type_integer) {
        return round_to_int((*value_node)(t).get(int()) * (*scalar)(t).get(Real()));
    } else if (get_type() == type_real) {
        return (*value_node)(t).get(Real()) * (*scalar)(t).get(Real());
    } else if (get_type() == type_time) {
        return (*value_node)(t).get(Time()) * (*scalar)(t).get(Time());
    } else if (get_type() == type_vector) {
        return (*value_node)(t).get(Vector()) * (*scalar)(t).get(Real());
    }

    assert(0);
    return ValueBase();
}

synfig::ValueBase
synfig::ValueNode_Scale::get_inverse(Time t, const synfig::Vector &target_value) const
{
    Real scalar_value((*scalar)(t).get(Real()));

    if (scalar_value == 0) {
        throw runtime_error(strprintf("ValueNode_Scale: %s", _("Attempting to get the inverse of a non invertible Valuenode")));
    } else {
        if (get_type() == type_real) {
            return target_value.mag() / scalar_value;
        }

        if (get_type() == type_angle) {
            return Angle::tan(target_value[1] / scalar_value, target_value[0] / scalar_value);
        }

        return target_value / scalar_value;
    }

    return ValueBase();
}

synfig::ValueBase
synfig::ValueNode_Scale::get_inverse(Time t, const synfig::Angle &target_value) const
{
    Real scalar_value((*scalar)(t).get(Real()));

    if (scalar_value == 0) {
        throw runtime_error(strprintf("ValueNode_Scale: %s", _("Attempting to get the inverse of a non invertible Valuenode")));
    } else {
        return target_value / scalar_value;
    }

    return ValueBase();
}

synfig::ValueBase
synfig::ValueNode_Scale::get_inverse(Time t, const synfig::Real &target_value) const
{
    Real scalar_value((*scalar)(t).get(Real()));

    if (scalar_value == 0) {
        throw runtime_error(strprintf("ValueNode_Scale: %s", _("Attempting to get the inverse of a non invertible Valuenode")));
    } else {
        return target_value / scalar_value;
    }

    return ValueBase();
}

bool
synfig::ValueNode_Scale::is_invertible(Time t) const
{
    Real scalar_value((*scalar)(t).get(Real()));
    return (!(scalar_value == 0));
}

bool
ValueNode_Scale::set_link_vfunc(int i, ValueNode::Handle value)
{
    assert(i >= 0 && i < link_count());

    switch (i) {
    case 0:
        CHECK_TYPE_AND_SET_VALUE(value_node, get_type());

    case 1:
        CHECK_TYPE_AND_SET_VALUE(scalar,     type_real);
    }

    return false;
}

ValueNode::LooseHandle
ValueNode_Scale::get_link_vfunc(int i)const
{
    assert(i >= 0 && i < link_count());

    if (i == 0) {
        return value_node;
    } else if (i == 1) {
        return scalar;
    }

    return 0;
}

bool
ValueNode_Scale::check_type(Type &type)
{
    return
        type == type_angle	||
        type == type_color	||
        type == type_integer	||
        type == type_real		||
        type == type_time		||
        type == type_vector;
}

LinkableValueNode::Vocab
ValueNode_Scale::get_children_vocab_vfunc()const
{
    if (children_vocab.size()) {
        return children_vocab;
    }

    LinkableValueNode::Vocab ret;

    ret.push_back(ParamDesc(ValueBase(), "link")
                  .set_local_name(_("Link"))
                  .set_description(_("The value node used to scale"))
                 );

    ret.push_back(ParamDesc(ValueBase(), "scalar")
                  .set_local_name(_("Scalar"))
                  .set_description(_("Value that multiplies the value node"))
                 );

    return ret;
}